/Engine/Source/Editor/UnrealEd/Public/Layers/LayersSubsystem.h
Adds selected actors to the named layers.
true if at least one actor was added. false is returned if all selected actors already belong to the named layers.
virtual bool AddSelectedActorsToLayers ( const [TArray](API\Runtime\Core\Containers\TArray)< [FName](API\Runtime\Core\UObject\FName) > & LayerNames )